tril·​lion | \ ˈtri(l)-yən \

Definition of trillion

1 : a number equal to 1,000 times one billion — see Table of Numbers
2 : an indeterminately large number a trillion mosquitoes out tonight

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Other Words from trillion

trillion adjective
trillionth \ ˈtri(l)-​yən(t)th \ adjective or noun

Examples of trillion in a Sentence

Recent Examples on the Web

Those trillions of dollars and wealth creation begin to finally move into the middle class and workers. Eric Johnson, Recode, "Tesla’s board is too weak to stop its CEO Elon Musk from tweeting," 5 Oct. 2018 Auto makers and tech companies are betting new services that will grow out of the effort will eventually generate hundreds of billions or even trillions of dollars in revenue. Mike Colias, WSJ, "GM President Dan Ammann to Take New Role as Head of Autonomous-Car Business," 29 Nov. 2018 Republicans are correct that enacting U.S. Sen. Bernie Sanders' single-payer plan would add trillions to government books, by placing all Americans on one government health insurer. Jeff Stein, The Seattle Times, "Does Bernie Sanders’ health plan cost $33 trillion — or save $2 trillion?," 31 July 2018 Beijing’s regulators still have an inadequate grasp of risks in the financial system, especially the trillions of dollars in deposit-like investment products. Peter Landers, WSJ, "The Old U.S. Trade War With Japan Looms Over Today’s Dispute With China," 13 Dec. 2018 The concentration was tiny — just 5 to 6 parts per trillion, an amount sometimes found in streams and rivers that receive municipal wastewater, say the scientists. Rachael Moeller Gorman, Good Housekeeping, "Is Your Tap Water Safe?," 15 Aug. 2012 Even better, the company Moon Express is raising billions to land on the moon and mine for gold and platinum purportedly worth trillions. Andy Kessler, WSJ, "The Company Implosion Pageant," 23 Sep. 2018 Our brains contain billions of neurons linked through trillions of synaptic connections. William Herkewitz, Popular Mechanics, "We Just Discovered 6 New Kinds of Brain Cells," 26 Nov. 2015 Ytterbium ticks trillions of times a second, and each of those ticks has to be incredibly precise. Avery Thompson, Popular Mechanics, "Here Is the World's Most Stable Atomic Clock," 28 Nov. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'trillion.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of trillion

1690, in the meaning defined at sense 1

History and Etymology for trillion

French, from tri- + -illion (as in million)

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Statistics for trillion

Last Updated

3 Feb 2019

Look-up Popularity

Time Traveler for trillion

The first known use of trillion was in 1690

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More Definitions for trillion



English Language Learners Definition of trillion

: the number 1,000,000,000,000 : one thousand billion
: a very large amount or number
British, old-fashioned : the number 1,000,000,000,000,000,000 : one million million million


tril·​lion | \ ˈtril-yən \

Kids Definition of trillion

: a thousand billions

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More from Merriam-Webster on trillion

Rhyming Dictionary: Words that rhyme with trillion

Spanish Central: Translation of trillion

Nglish: Translation of trillion for Spanish Speakers

Britannica English: Translation of trillion for Arabic Speakers

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